hi,

see generally ncert book is best recommend for the cbse board students as text book for 12th course preparation. however you may surely study ncert books as reference book as  state board student if you are preparing for exams like neet, jee main like all india level exam preparation.

first of all your conception of the 12th course should be very clear and must have idea of the 12th course full syllabus.

hope you understand.